Water glass is not slaked lime. You are confusing 2 different methods.
Water glass, also called
sodium silicate or
soluble glass, a
compound containing
sodium oxide (Na2O) and
silica (silicon dioxide, SiO2) that forms a glassy solid with the very useful property of being soluble in water. Water
glass is sold as solid lumps or powders or as a clear, syrupy liquid. It is used as a convenient source of sodium for many industrial products, as a builder in laundry detergents, as a binder and adhesive, as a flocculant in water-treatment plants, and in many other applications.
Then this site said:
NOTE: These are two separate ways to preserve eggs. You can use slaked lime OR water glass, but not both together.
https://vintagerecipesandcookery.com/preserve-eggs-slaked-lime-water-glass/
Slaked/slacked lime is calcium hydroxide. It is made when calcium oxide (called lime or quicklime) is mixed, or “slaked” with water. Limewater is the common name for a saturated solution of calcium hydroxide. Reference – Wikipedia.
Then from Wiki:
The rocks and minerals from which these materials are derived, typically limestone or
chalk, are composed primarily of
calcium carbonate. They may be cut, crushed, or pulverized and chemically altered.
Burning (
calcination) of these minerals in a
lime kiln converts them into the highly
caustic material
burnt lime,
unslaked lime or
quicklime (
calcium oxide) and, through subsequent addition of water, into the less caustic (but still strongly
alkaline)
slaked lime or
hydrated lime (
calcium hydroxide, Ca(OH)2), the process of which is called
slaking of lime.
When the term is encountered in an agricultural context, it usually refers to
agricultural lime, which today is usually crushed limestone, not a product of a lime kiln. Otherwise it most commonly means
slaked lime, as the more dangerous form is usually described more specifically as
quicklime or
burnt lime.
